Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Virtanen, S. M. M."'
We study the energetic and dynamic stability of coreless vortices in nonrotated spin-1 Bose-Einstein condensates, trapped with a three-dimensional optical potential and a Ioffe-Pritchard field. The stability of stationary vortex states is investigate
Externí odkaz:
http://arxiv.org/abs/0706.1870
Publikováno v:
Phys. Rev. A 74, 023603 (2006)
We study stationary clusters of vortices and antivortices in dilute pancake-shaped Bose-Einstein condensates confined in nonrotating harmonic traps. Previous theoretical results on the stability properties of these topologically nontrivial excited st
Externí odkaz:
http://arxiv.org/abs/cond-mat/0701285
Publikováno v:
Phys. Rev. A 74, 063619 (2006)
Multiquantum vortices in dilute atomic Bose-Einstein condensates confined in long cigar-shaped traps are known to be both energetically and dynamically unstable. They tend to split into single-quantum vortices even in the ultralow temperature limit w
Externí odkaz:
http://arxiv.org/abs/cond-mat/0609313
Publikováno v:
Phys. Rev. Lett. 97, 110406 (2006)
Recently, the splitting of a topologically created doubly quantized vortex into two singly quantized vortices was experimentally investigated in dilute atomic cigar-shaped Bose-Einstein condensates [Y. Shin et al., Phys. Rev. Lett. 93, 160406 (2004)]
Externí odkaz:
http://arxiv.org/abs/quant-ph/0605125
Publikováno v:
Phys. Rev. A 71, 023604 (2005)
We study the energies and decay of elementary excitations in weakly interacting Bose-Einstein condensates within a finite-temperature gapless second-order theory. The energy shifts for the high-lying collective modes turn out to be systematically neg
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502441
Publikováno v:
J. Low Temp. Phys. 103, 473 (2002)
The formation of quantized vortices in trapped, gaseous Bose-Einstein condensates is considered. The thermodynamic stability of vortex states and the essential role of the surface excitations as a route for vortex penetration into the condensate are
Externí odkaz:
http://arxiv.org/abs/cond-mat/0209051
Publikováno v:
Phys. Rev. A 66, 035601 (2002)
The surface mode spectrum is computed self-consistently for dilute Bose-Einstein condensates, providing the temperature dependence of the surface mode induced vortex nucleation frequency. Both the thermodynamic critical frequency for vortex stability
Externí odkaz:
http://arxiv.org/abs/cond-mat/0204177
Autor:
Virtanen, S. M. M., Salomaa, M. M.
We study the stability of vortices in trapped single-component Bose-Einstein condensates within self-consistent mean-field theories--especially we consider the Hartree-Fock-Bogoliubov-Popov theory and its recently proposed gapless extensions. It is s
Externí odkaz:
http://arxiv.org/abs/cond-mat/0203257
Publikováno v:
Phys. Rev. A 65, 033614 (2002)
Multiply quantized vortices in trapped Bose-Einstein condensates are studied using the Bogoliubov theory. Suitable combinations of a localized pinning potential and external rotation of the system are found to energetically stabilize, both locally an
Externí odkaz:
http://arxiv.org/abs/cond-mat/0109272
Publikováno v:
J. Phys.: Condens. Matter 13 (2001) L819-L824
We compute structures of vortex configurations in a harmonically trapped Bose-Einstein condensed atom gas within three different gapless self-consistent mean-field theories. Outside the vortex core region, the density profiles for the condensate and
Externí odkaz:
http://arxiv.org/abs/cond-mat/0108462